Sinced I dislike having long lines of students waiting for me to edit their papers, I have them put their numbered clothespins on my clipboard so that I'll know who is ready to go.
I call the student's number--the one closest to the bottom of clipboard--and edit with him. When we're done, the student returns the clothespin to the storage spot so that it will be available when it's time to edit the next section.
Those who are waiting to be called self-edit, continue adding to the assignment, or read silently.
It has worked out really smoothly over the last year.
The Classical Academy